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How a Nationwide Surveillance Study Linked Reproducibility to Better Clinical Decisions

Ellen Ovenden, MSc | May 31, 2026

Ellen Ovenden, MSc | May 31 2026

Screening and treating 456 people for H. pylori could prevent one gastric cancer case.¹

Achieving this impact at a population level depends on reliable infection surveillance, something that becomes much more difficult when studies span dozens of locations and thousands of participants.

In the webinar Nationwide Scaling of Infection Surveillance: A Reproducibility Case Study, the 2025 JoVE Researcher Innovation Award winner Dr Liang Wang and coauthor Dr Alfred Tay showed what that takes in practice.

Their China MAP project used one noninvasive string test and qPCR workflow across 26 provinces, 52 cities, and almost 13,000 individuals. The study results — an urban H. pylori prevalence of 27% and antibiotic resistance rates up to 51% — have direct implications for treatment decisions.²

Three Lessons From The Study

The first lesson from this project stems from the clinical reality Dr Tay described in the webinar: doctors need something fast, practical, and usable outside of major hospitals.

1. A scalable method has to work in real clinical settings.

▪️ For Dr Wang of Guangdong Provincial People’s Hospital and Dr Tay of the Marshall Centre at the University of Western Australia, this was not only a lab question. The method had to be fast, noninvasive, and practical enough for use in resource-limited settings.

The string test supported resistance testing in settings where repeat endoscopy or complex culture workflows were not realistic.

2. Standardization turns local data into national insights.

▪️ The scale of the China MAP project was impressive, but the bigger point was consistency. Dr Wang explained that earlier surveillance data were fragmented and based on mixed methods.

Using one workflow across sites produced more comparable prevalence and resistance data, making the results much more useful for treatment decisions and public health planning.

3. Reproducibility depends on more than written protocols.

▪️ Dr Wang was clear that nationwide expansion required protocol standardization first. He described the JoVE article as especially useful because it combined a text protocol with a video protocol, so staff could see each step instead of interpreting difficult parts from writing alone.

Key Takeaway

At the start of the webinar, Director of Editorial Ben Werth pointed to a common problem in research: written methods often leave too much open to interpretation.

The MAP project highlights a key challenge in multicenter research: even small differences in how protocols are performed can affect results. Visual protocols can help reduce ambiguity by showing researchers exactly how each critical step should be executed.

Learn more about publishing visually to improve the reproducibility of your work.

Learn more

Park, J. Y., Lee, Y.-C., Moayyedi, P., Lansdorp-Vogelaar, I., Camargo, M. C., Tepeš, B., et al. (2026). Helicobacter pylori screen-and-treat programs for gastric cancer prevention: IARC Working Group Report. New England Journal of Medicine, 394(11), 1131-1137. https://doi.org/10.1056/NEJMsb2515372
Wang L, Li Z, Tay C, et al. (2024). Multicentre, cross-sectional surveillance of Helicobacter pylori prevalence and antibiotic resistance to clarithromycin and levofloxacin in urban China using the string test coupled with quantitative PCR. The Lancet Microbe, 5, e512-e513. https://doi.org/10.1016/S2666-5247(24)00027-2